<a href="https://en.wikipedia.org/wiki/Phase-locked_loop#Clock_generation"
  >Broken on Travis and *nix machines</a
>

<a href="https://jekyllrb.com/docs/configuration"
  >Also broken on Travis and *nix machines</a
>

<a href="https://rtyley.github.io/bfg-repo-cleaner/#usage"
  >Also broken on Travis and *nix machines</a
>
